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Step-by-step explanation:
lets suppose lower class limit is X and upper class limit is y. so class mark will be (x+y)/2 so X+y will be 7.5*2=15 and class size is 10 i.e. y-x =10
y+x=15
y-x=10
adding both equations
2y=25
y=12.5
so X will be 2.5.
the class is 2.5-12.5
Answer:
please mark as brainliest
Step-by-step explanation:
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